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Finding the Fourth Proportional to 758.68, 1,137.89 and 210.74

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Solution

The fourth proportional to 758.68, 1,137.89 and 210.74 is: 316.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.68 : 1,137.89 = 210.74 : x
  2. Step 2: Convert to fraction form
    758.68/1,137.89 = 210.74/x
  3. Step 3: Cross multiply
    758.68x = 1,137.89 × 210.74
  4. Step 4: Simplify right side
    758.68x = 239,802.31
  5. Step 5: Solve for x
    x = 239,802.31/758.68
  6. Step 6: Final answer
    x = 316.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.